RTCTransformEventRunnable.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

#include "RTCTransformEventRunnable.h"

#include "nsIGlobalObject.h"

#include "ErrorList.h"

#include "nsError.h"

#include "nsDebug.h"

#include "nsLiteralString.h"

#include "mozilla/RefPtr.h"

#include "mozilla/AlreadyAddRefed.h"

// This needs to come before RTCTransformEvent.h, since webidl codegen doesn't

// include-what-you-use or forward declare.

#include "mozilla/dom/RTCRtpScriptTransformer.h"

#include "mozilla/dom/RTCTransformEvent.h"

#include "mozilla/dom/RTCTransformEventBinding.h"

#include "mozilla/dom/EventWithOptionsRunnable.h"

#include "mozilla/dom/Event.h"

#include "mozilla/dom/EventTarget.h"

#include "mozilla/dom/RootedDictionary.h"

#include "js/RootingAPI.h"

#include "js/Value.h"

#include "libwebrtcglue/FrameTransformerProxy.h"

namespace mozilla::dom {

RTCTransformEventRunnable::RTCTransformEventRunnable(

    Worker& aWorker, FrameTransformerProxy* aProxy)

    : EventWithOptionsRunnable(aWorker, "RTCTransformEventRunnable"),

      mProxy(aProxy) {}

RTCTransformEventRunnable::~RTCTransformEventRunnable() = default;

already_AddRefed<Event> RTCTransformEventRunnable::BuildEvent(

    JSContext* aCx, nsIGlobalObject* aGlobal, EventTarget* aTarget,

    JS::Handle<JS::Value> aTransformerOptions) {

  // Let transformerOptions be the result of

  // StructuredDeserialize(serializedOptions, the current Realm).

  // NOTE: We do not do this streams stuff. Spec will likely change here.

  // The gist here is that we hook [[readable]] and [[writable]] up to the frame

  // source/sink, which in out case is FrameTransformerProxy.

  // Let readable be the result of StructuredDeserialize(serializedReadable, the

  // current Realm). Let writable be the result of

  // StructuredDeserialize(serializedWritable, the current Realm).

  // Let transformer be a new RTCRtpScriptTransformer.

  // Set transformer.[[options]] to transformerOptions.

  // Set transformer.[[readable]] to readable.

  // Set transformer.[[writable]] to writable.

  RefPtr<RTCRtpScriptTransformer> transformer =

      new RTCRtpScriptTransformer(aGlobal);

  nsresult nrv = transformer->Init(aCx, aTransformerOptions,

                                   GetCurrentThreadWorkerPrivate(), mProxy);

  if (NS_WARN_IF(NS_FAILED(nrv))) {

    // TODO: Error handling. Currently unspecified.

    return nullptr;

  // Fire an event named rtctransform using RTCTransformEvent with transformer

  // set to transformer on worker’s global scope.

  RootedDictionary<RTCTransformEventInit> init(aCx);

  init.mBubbles = false;

  init.mCancelable = false;

  init.mTransformer = transformer;

  RefPtr<RTCTransformEvent> event =

      RTCTransformEvent::Constructor(aTarget, u"rtctransform"_ns, init);

  event->SetTrusted(true);

  return event.forget();

}  // namespace mozilla::dom